Remember the first time you saw Erika Wennerstrom sing in front of the Heartless Bastards and watched amazed as she pummeled her guitar and sang with a ferocity that made her neck veins dance like a cobra in a snake charmer’s basket? Brittany Howard approaches her role fronting Alabama Shakes with a similarly wrought intensity and to a familiar result. Like the Bastards and Grace Potter & the Nocturnals, Howard and Alabama Shakes channel ’60s Blues Rock with a contemporary edge on their excellent full-length debut, Boys and Girls. It’s not hard to play spot-the-influences with the Shakes, as the broad experience of the individual members found them looking for the commonalities between James Brown and Otis Redding and Led Zeppelin and AC/DC while working up an early set list. The mega versatile Howard finds them easily with a fluid guitar style that can be Doo Wop sock-hop one minute (“Heartbreaker,” the title track), elephant-gun recoil the next (the Joan Armatrading-steered-by-Jimi Hendrix howl of “Be Mine,” the loping groin kick of “Hold On”). Vocally, she wails with the hellhound authority of her Soul and Blues influences while pushing the needle into Rock God territory; comparisons to Janis Joplin are not the least bit out of line. Boys and Girls would be an impressive accomplishment from a band in its middle period, but it’s made all the more amazing considering the Shakes have only been together for three years and this represents only their second release. Howard and her cohorts in Alabama Shakes have an impeccable sense of Blues Rock classicism and an exciting sense of how to give it a good rowdy slap into right now.